Once the hard core is shot into the back of your neck, an assassin's brain waves can be transmitted into your body--circumventing your brain functions--taking complete control of your body.

When assassins use this technology--your killer can be anyone; your barber, your neighbor or your wife. They are the best assassins in the world--but what happens when one of their own turns against them? Who can you trust when your enemy can change his appearance as easy as someone changes a shirt?*Source: imagecomics.com